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This dataset is a polygon coverage of minable thickness for the Pond Creek coal zone in Kentucky, West Virginia, and Virginia. The coverage was created by gridding 4,391 points and contouring the grid with 1.17-ft intervals. The polygons have elevation values halfway between the bounding contour arc values. This dataset honors data submitted for the asessment from the Kentucky Geological Survey; therefore contour lines may not match across State lines (see Process Steps). This map is one of many Geographic Information System (GIS) products of the National Coal Assessment that is being conducted by the U.S. Geological Survey in cooperation with State geological surveys and other Federal and State agencies. The Middle...
Aeromagnetic data were collected along flight lines by instruments in an aircraft that recorded magnetic-field values and locations. This dataset presents latitude, longitude, altitude, and magnetic-field values.
Contours of potentially minable thickness for the Fire Clay coal zone in Virginia, Kentucky, and West Virginia
This dataset represents the thickness of the potentially minable Fire Clay coal benches in Virginia, West Virginia, and Kentucky. The coal zone is known by other names, depending upon locale. The data were comprised of values from Kentucky in EXCEL format, data searched from the USGS' NCRDS database for Virginia and entered into StratiFact, and a StratiFact database obtained from the West Virginia Geological and Economic Survey (WVGES). Point data were gridded, the grid contoured and imported to ARC/INFO as polygons. The Kentucky portion was replaced by a polygonal thickness coverage obtained from the Kentucky Geological Survey that had been manually contoured, therefore State line discrepancies are to be expected....
This dataset is a polygon coverage of structure contours (elevation) for the Pond Creek coal zone in Kentucky, West Virginia, and Virginia. The surface was created by gridding information from 137,355 points and contouring the grid into 100-ft intervals. Many of the points were derived from existing structure contoure maps obtained from Kentucky and West Virgina. In Virginia, data were searched from the StratiFact database created from the National Coal Resource Data System (NCRDS). Data from specific quadrangles in the StratiFact database from the West Virginia Geological and Economic Survey were also searched. The grid was created in EarthVision, was contoured and imported to ARC/INFO as polygons using an AML....